Background notifications working on some devices but not on others

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Hi there,

I've spent the last few hours trying to get background notifications to work on one of my two test devices, to no avail. Here's the current setup.

I have an iPhone SE and an iPhone 7 Plus. Both have the same version of iOS, 11.2.2, the latest one. They're both running the exact same version of the app. They have both given the same permissions for both notifications and background app refresh.

This is an example of what I'm sending:

{
"audience": {
"named_user": "4"
},
"notification": {
"ios" : {
"content-available": true,
"priority": 5
}
},
"device_types": ["ios"]
}

The situation with the iPhone SE is as follows:

receivedForegroundNotification delegate function is triggered when a foreground push is sent.

receivedBackgroundNotification delegate function is triggered when a background push is sent.

The situation with the iPhone 7 Plus is as follows:

Neither of the Urban Airship delegate functions are triggered.

HOWEVER: When I send a simple "Hello" alert it comes through just fine with the app in the background, though it never triggers any code.

So clearly the device is registered. As far as Urban Airship is telling me from the dashboard, both of the named users' devices (they're different named users) have given all green consent.

I don't know what else could be wrong. I can post some of my code if you guys want but given that it works fine on one device and not on another, I can't imagine that's the issue. Any help would really be much appreciated.